The Democratic Party surveys in Ohio included 708 likely voters, while the Texas survey of Democrats included 704 likely voters. Both surveys were conducted Feb. 26-28, 2008, and carry margins of error of +/- 3.8 percentage points.

The Republican survey in Ohio included 592 likely voters and carries a margin of error of +/- 4.1 percentage points. In Texas, the GOP survey included 605 likely voters and carries a margin of error of +/- 4.1 percentage points. Both GOP surveys were conducted Feb. 26-28, 2008.

The surveys were all conducted using live English- and Spanish-speaking telephone operators working in Zogbys call center in Upstate New York.